\documentclass{article}

\usepackage{
amsmath,
tikz,
pgfplots,
}

\usepgfplotslibrary{
groupplots,
}

\begin{document}
\begin{tikzpicture}
\begin{groupplot}[
group style={
    group size=4 by 4, %4 column(s), 4 row(s)
    horizontal sep=0cm,
    vertical sep=1.5cm,
    ylabels at=edge left,
    yticklabels at=edge left,
},
xlabel={Bla},
ylabel={Process},
%
every x tick scale label/.append style={
    at={(0.95,0)},yshift=-1.5em,anchor=north,inner sep=0pt
},
every y tick scale label/.append style={
    at={(-0.05,0.99)},anchor=east,inner sep=0pt
},
scale ticks above exponent={2}
]
\nextgroupplot
\addplot[only marks] coordinates{(1,1200) (3,500)};
\nextgroupplot
\addplot[only marks] coordinates{(2,1200) (4,400)};
\end{groupplot}
\end{tikzpicture}

NEXT:

\begin{tikzpicture}
\begin{groupplot}[
group style={
    group size=1 by 2, %4 column(s), 4 row(s)
    horizontal sep=1.5cm,
    vertical sep=0cm,
    xlabels at=edge bottom,
    xticklabels at=edge top,
},
xlabel={Bla},
ylabel={Process},
%
every x tick scale label/.append style={
    at={(0.95,1)},yshift=5.5em,anchor=north,inner sep=0pt
},
every y tick scale label/.append style={
    at={(-0.05,0.99)},anchor=east,inner sep=0pt
},
scale ticks above exponent={2}
]
\nextgroupplot
\addplot[only marks] coordinates{(1200,1200) (3000,500)};
\nextgroupplot
\addplot[only marks] coordinates{(2000,1200) (4000,400)};
\end{groupplot}
\end{tikzpicture}
\end{document}
